So I watch this ?prototype? after I finished the main anime. As a person who doesn't get to abroad the hype train leading to the full anime, I think this short episode really do justice to set off the vibe of the anime. If you plan to watch the main series and don't know how you feel, just watch this first to decide whethee to watch it or not. The only difference would be in animation alone. Same character, same pace, same plot. Me personally just happy to see more content of the three MC girls because they are so adorable even in the earlydays, barely anything change except now they got backstory and all in the main anime. While in here, they just kinda introduce what kind of activities we will expecting when the full anime release.